
The FSP Group VITA-850GM is an 850W fully modular ATX 3.1 power supply with a single fan mode. Priced at $139 USD MSRP, it is available in both black and white, with the white version being slightly more expensive. As an ATX 3.1 unit, it includes a 12V-2x6 cable to handle high-wattage GPUs, although neither the cable nor the documentation specifies the power rating. Given the unit's 850W capacity, we estimate the cable is rated at 600W.
The VITA-850GM is marketed at 80PLUS Gold, however in the CLEAResult report, CLEAResult rated this power supply at 80PLUS Platinum. This may not be an error in marketing, as FSP Group may just be conservatively rating this power supply knowing that not every unit is Platinum performing.
Although it did not excel in every test, the VITA-850GM delivered average performance across the board. Its strengths in load regulation and low voltage ripple make it a good choice for users seeking reliable and stable power for most setups.
WHAT YOU NEED TO KNOW
THE GOOD
- ATX Version
This is an ATX 3.1 power supply so it is designed to the latest version and should be capable of handling high power GPUs.
- Performance
It performed well in voltage ripple and load regulation tests, making it a solid performer in these areas.
THE BAD
- Nothing at the time of writing
THE REST
- Overall
We recommend the FSP Group VITA-850GM power supply due to its good load regulation and low voltage ripple. These factors make it a reliable option for users seeking stable power delivery.
The FSP Group VITA-850GM is an ATX form factor power supply that includes standard accessories along with a bonus PSU tester. However, the power supply is secured with only cardboard inserts, which offers minimal support compared to the sturdier foam packaging typically used with other power supplies. The cardboard inserts may not provide enough protection to drops or bumps during the shipping process.
The user documentation, both included and downloadable, provides extensive information about connectors and pinouts. The power supply features moderately flexible cables, with the 12V-2x6 cable being the only one that is sleeved. For cooling, it is equipped with a 120mm hydraulic bearing fan.
On the FSP Group specifications webpage, it specifies that the Operating Temperature is up to 40°C, though we cannot verify this through testing.
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Front of the box.
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Power input side of the PSU.

Top of the PSU displaying the fan.

Bottom of the PSU displaying the specifications.
+12 V | +5 V | +3.3 V | +5 Vsb | -12 V | |
---|---|---|---|---|---|
CURRENT | 70.83 A | 20 A | 20 A | 3 A | 0.3 A |
WATTAGE | 850 W | 100 W | 15 W | 3.6 W | |
850 W |
Please note that the above ratings are manufacturer advertised specifications.
The VITA-850GM includes a single fan mode that remains on at all times. It comes with all the standard protections expected from a power supply of its class and is backed by a 10-year warranty.
The VITA-850GM showed decent performance during testing, particularly in load regulation. The 12V rail had a 0.124V voltage drop across the full 850W output range, which remains within ATX specifications and is comparable to other similar power supplies.
In ripple testing, the power supply performed better than average, showing a peak-to-peak ripple of only 26 mV on the 12V rail at full load. The 5V and 3.3V rails also performed well, exhibiting signal ripples of 17 mV and 20 mV, respectively.
However, the VITA-850GM did not pass all the excursion tests, it failed the longest excursions at lower temperatures while passing all excursions at 40C. While it is compatible with most systems, it may struggle with more demanding high-end hardware.
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The FSP Group VITA-850GM is 80PLUS Platinum certified, achieving 92% efficiency at 50% load. It met all the Platinum requirements except at 50% load with 230V input. During efficiency testing, the power supply displayed an unusual drop in efficiency at 2% load, although performance at other load points was as expected.
In terms of brownout performance, the VITA-850GM sustained a 12 ms dropout at full rated load for both 115V and 230V inputs, which is average for power supplies of this class.
The OPP and OCP triggered at slightly lower thresholds than comparable units. The 12V OCP activated at 112%, while the other rails were around 130%, except for the -12V rail, which reached 300%. The OPP engaged at 125% of the rated load, which is lower than similarly rated power supplies. This ensures protection but may lead to occasional shutdowns under extremely high loads.
